The 'Creating Shared Variables' section at the beginning should cover what you need to know. (Except, for Data Dashboard, 'Variable Type' should be 'Network Published', not 'Single Process' as the tutorial uses).

Once you have nodes on your diagram that write to your variables (the 'Variable References' section of that tutorial), you can deploy the variable library in your LabVIEW project, run your VI, then you should be able to connect those variables from the Data Dashboard mobile apps.